The HECU(Hydraulic and Electronic Control Unit) monitors the wheel speed sensor signal continuously.
This code is set when the sensor air gap is out of specified range or when the ABS control cycle is continued abnormally.
Warning lamp is turned OFF unless additional faults are detected when the IG KEY is turned ON again, and wheel speed is more than predefined speed.
Item | Detecting Condition | Possible cause | |
Case 1 | DTC Strategy |
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Large air-gap monitoring | 1. Improper installation of wheel speed sensor (FR) 2. Abnormal Rotor and wheel bearing 3. Large Air-Gap 4. Faulty Wheel speed sensor (FR) |
Enable Conditions |
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When the minimum wheel velocity is 2km/h(1.2mph) and the velocity of other wheels exceed 10km/h(6.2mph) with the acceleration under 0.4g, the condition is continued for 150msec.
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When the velocity of more two wheels is 2km/h(1.2mph) and the max. wheel velocity exceeds 10km/h(6.2mph) with the acceleration under 0.4g, the condition is continued for 20 sec.
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If the vehicle acceleration is above 0.4g in above conditions the failure detection time is 3 minutes.
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After velocity of 4 wheels exceeds 10km/h(6.2mph), if the velocity of 1 wheel or 2 wheels is below 0.25km/h for 12 seconds | ||
Case 2 | DTC Strategy |
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Long term ABS mode monitoring | |
Enable Conditions |
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During the ABS control cycle, if the wheel velocity of 2km/h(1.2mph) is lasted for more than 12sec.
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If the ABS control cycle is continued for more than 36sec.
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If the wheel speed is above 512km/h (318mph) longer than 100ms | ||
Fail Safe |
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One wheel speed sensor fault - Inhibit the ABS/ESP(ESC)/DBC/AVH control, allow the EBD control
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More than 2 wheel speed sensor fault - All functions are inhibited | ||
MIL |
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One wheel speed sensor fault - The ABS/ESP(ESC)/DBC warning lamps are activated. The AVH warning lmap is activated in case of the vehicle equipped with AVH.
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More than 2 wheel speed sensor fault - The EBD/ABS/ESP(ESC)/DBC warning lamps are activated. The AVH warning lmap is activated in case of the vehicle equipped with AVH. | ||
Reset Condition |
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Below conditions are met for more than 3sec after IG turned on again. - Minimum wheel speed is faster than 2km/h - Wheel speeds are between 0.6 X Vmax and 1.4 X Vmin - Delta wheel speed for 10msec is lower than 2km/h | ||
